The science

The Library

The practices at Halcyon are old. The research on them is newer, and growing. These are the studies we read and return to, each with a short note in plain language and a link to the original paper. We share them to inform, not to promise, and none of it is medical advice.

2 studies

Massage

A Preliminary Study of the Effects of a Single Session of Swedish Massage on Hypothalamic-Pituitary-Adrenal and Immune Function in Normal Individuals

Rapaport MH, Schettler P, Bresee C

The Journal of Alternative and Complementary Medicine · 2010

This study asked what a single Swedish massage does inside the body of a healthy person. Healthy adults aged 18 to 45 received either 45 minutes of Swedish massage or a carefully matched light touch session at an academic medical center. Researchers took repeated blood samples to measure hormones and immune markers. Compared with light touch, massage produced a large decrease in arginine vasopressin, a hormone linked to stress and blood pressure, and a small decrease in cortisol. Massage also increased the number of several types of circulating immune cells and lowered levels of a range of inflammatory signalling molecules. The researchers had expected oxytocin to explain these effects, but it did not. The authors describe the results as preliminary and needing replication, and the abstract does not report a large sample.

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Massage

A Meta-Analysis of Massage Therapy Research.

Moyer CA, Rounds J, Hannum JW

Psychological Bulletin · 2004

This landmark meta-analysis in Psychological Bulletin gathered 37 randomized studies of massage therapy and calculated average effects across nine outcomes. A single massage session reduced state anxiety, blood pressure and heart rate, but did not measurably change negative mood, immediate pain ratings or cortisol. A course of multiple sessions reduced pain measured later on. The largest effects were reductions in trait anxiety and depression after a course of treatment, which the authors note were similar in size to those seen with psychotherapy. No factors were found that reliably changed how well massage worked. The authors argue that massage may be better understood through a psychotherapy lens than a purely medical one. A limitation is age: the analysis is from 2004, and the number of studies for some outcomes was modest.

Read the original ↗